Supporting immunomodulatory agent

ABSTRACT

The invention relates to a combination therapy for the prevention and/or treatment of immune-mediated chronic inflammatory and autoimmune diseases comprising a combination of one or more C3-C8 carboxylic acids, physiologically acceptable salts and/or esters thereof, and one or more fumaric acid esters and/or salts thereof. The combination being particularly useful in the treatment of psoriasis and multiple sclerosis.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. National Stage application 151769282, filed on Apr. 18, 2018, now U.S. Pat. No. 10,695,305, under 35 U.S.C. § 371 of PCT/EP2016/066350, filed on Apr. 27, 2017, which claims priority to PCT/EP2015/074179, filed on Oct. 19, 2015, and to DE 10 2016 103 242.5, filed on Feb. 24, 2016.

TECHNICAL FIELD

The invention relates to a combination therapeutic for use in the treatment of autoimmune diseases and immune-mediated chronic inflammatory diseases comprising administering one or more C₃-C₈ carboxylic acids and their physiologically acceptable salts and/or esters, and one or more fumaric acid esters and/or salts thereof. The combination is particularly effective for immunemediated diseases and irritations such as psoriasis, multiple sclerosis and neurodermatitis.

BACKGROUND

In autoimmune-related diseases the body's own tissues are targeted as a result of a dysfunctional immune response, for example in multiple sclerosis (MS) and in immune-mediated chronic inflammatory diseases that cause inflammation in various tissues, including the intestines (Crohn's disease, ulcerative colitis), in the skin (psoriasis) or of the joints (spectrum of rheumatic diseases). Common to all these disease conditions is that due to the inflammation other disease conditions may occur with an above-average frequency, such as excess weight, high blood pressure, arteriosclerosis, cardiac infarction, and stroke.

Recent knowledge gained in the field of microbiomes has shown that nutrition, the intestinal microbiome, and the local cellular immune response are interconnected. This suggests that dietary measures can have an influence on the cellular immune response and thus on the course of autoimmune diseases and immune-mediated chronic inflammatory diseases

The diversity of the microbiome of the intestine plays an important role. Despite many unanswered questions concerning which components of the microbiome are actually responsible for a differentiated adaptive immune response in the intestinal region, a great amount of empirical information has been collected suggesting that individual types of bacteria and their bacterial metabolites exert a considerable influence on the systemic immune response in connection with autoimmune diseases and immune-mediated chronic inflammatory diseases, for example, in the case of 1 diabetes and Crohn's disease.

It has been found that the intestinal microbiome can be influenced by the type of nutrition consumed and is able to adapt to conditions created by a given kind of food. This means that an intestinal microbiota unfavorable to the immune status of a patient can be changed by taking suitable dietary measures aimed at improving the immune status of the patient.

The intestinal microbiome and dietary habits, such as a high salt intake, have recently been identified as environmental factors in the pathogenesis of multiple sclerosis (MS), an example of an autoimmune-related disease of the central nervous system mediated by T cells. The influence of the intestinal microbiome on chronic inflammatory diseases of the intestines and type 1 diabetes was mentioned above. Distinctive characteristics of the intestinal microbiota have also been detected in patients suffering from type 2 diabetes. Additionally, an association with neurodegenerative diseases (Parkinson's Alzheimer's) has also been suggested. Recent evidence also shows that there is a major alteration of the intestinal microbiome in the event of renal insufficiency.

An essential role in-autoimmune diseases and in immune-mediated chronic diseases is the action of regulatory T cells (Treg). Treg cells, also known as suppressor T cells, control the activity of the immune system. A deficiency of Treg cells is associated with numerous autoimmune diseases.

Fatty acids have a major influence on the intestinal microbiome as well as on regulatory T cells. It has been reported that long-chain fatty acids have proinflammatory activity. It has now surprisingly been found that short-chain fatty acids have a positive effect on the proliferation and amount of regulatory T cells. This was particularly the case for propionic and butyric acid and their physiologically acceptable salts and esters. Moreover, it has been determined that the targeted administration of short-chain fatty acids with three to six carbon atoms has a positive influence on the development and progression of neuroimmunological diseases with neurodegenerative aspects, like MS.

The use of fumaric acid esters and salts, in particular dimethyl fumarate and salts of monomethyl fumaric acid, for the treatment of MS and psoriasis has been known for years. These agents are effective, but their administration at the threshold of effectiveness is associated with unpleasant side effects, such as gastrointestinal problems and reddening of the skin. The gastrointestinal problems seem to be associated with irritation of the gastric mucosa. In addition, the use of fumarates is associated with leukopenia.

Fumarates are administered—primarily as dimethyl fumarate—in daily doses of usually 2×120 mg (starting dose) or 2×240 mg (maintenance dose). In individual cases a higher dose may be required. Patient doses are often individually adjusted. In MS therapy, dimethyl fumarate is administered as a monotherapy, in psoriasis therapy fumarates are administered as a combination preparation in daily doses of 100 mg to 1.2 g.

SUMMARY OF THE INVENTION

The invention is based on the finding that short-chain fatty acids are conducive to significantly increasing the amount of Treg cells in the short term when administered in combination with fumarates. The increase in Treg cells is much greater for fumarates than for other drugs approved for the treatment of MS.

Accordingly, the invention relates to a combination preparation for use in the prophylaxis and therapy of immune-mediated chronic inflammatory and autoimmune diseases, comprising a combination of C₃-C₈ fatty acid, physiologically tolerable salts and/or esters thereof and one or more fumaric acid esters and/or their physiologically acceptable salts thereof.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a graph showing the results of a study comparing the effect of a lauric acid diet compared to a control group on SEM clinical assessments in a mouse experimental autoimmune encephalomyelitis (EAE) model.

FIG. 2 is a graph showing the effect of a propionic acid diet initiated at the time of disease induction (DI) or at the time of onset of symptoms (OD) compared to a control group on SEM in the mouse EAE model.

FIG. 3: is a graph showing the effect of propionic acid diet initiated at the time of disease induction (DI) or at the time of onset of symptoms (OD) compared to a diet control group on relative axonal density, demyelination in the white matter, and CD3+ cells in the mouse EAE model.

FIG. 4: is a graph showing the effect of propionic acid diet initiated at the time of disease induction (DI) compared to a control group on levels of CD4+CD25+ Foxp3 cells in mouse EAE model

FIG. 5 is a graph showing the effect of lauric acid diet (250 μM and 500 μM) initiated at the time of disease induction (DI) compared to a control group on levels of CD4+CD25+ Foxp3 cells in mouse EAE model,

FIG. 6 shows a comparison of the ratio of Treg cells after administration of 2×0.5 g sodium propionate together with fumarates for the treatment of MS in the standard dose before and after 14 days of treatment.

DETAILED DESCRIPTION OF THE INVENTION

Autoimmune-related diseases referred to here are primarily those whose development is associated with abnormalities in the intestinal microbiota and in the occurrence of regulatory T cells. For example, these include neurodegenerative diseases such as MS or other autoimmune-related disease such as psoriasis, inflammatory bowel disease (IBD), rheumatoid arthritis and the various types of diabetes.

The inventive effect is limited to short-chain carboxylic acids, i.e. those with no more than eight carbon atoms. With longer chained carboxylic acids opposite effects are observed. Carboxylic acids with twelve or more carbon atoms usually exert a negative effect on the development and progression of the disease.

Especially preferred C₃-C₈ carboxylic acids are propionic acid and butyric acid as well as their salts and esters.

The term carboxylic acids is understood to mean monocarboxylic acids preferably of the straight-chain configuration. The monocarboxylic acids may also contain double bonds. However, preferred are straight-chained saturated carboxylic acids, in particular those with three or four carbon atoms.

The alkali and alkaline earth metal salts are most preferable as physiologically acceptable salts. Additionally, salts of physiologically safe or essential heavy metals, for example zinc or iron can be used. Of the alkali metals, sodium and potassium are especially preferred, as are magnesium and calcium of the alkaline earth metals.

Regarding esters, preference is given to methyl and ethyl esters.

The short-chain fatty acids and their esters and salts are combined with fumaric acid esters and their salts. The active substances can be administered as a combination preparation, but also separately.

Dimethyl fumarate is particularly suitable as a fumaric acid ester, but other fumarate esters with C₁₋₆ alcohols may also be used. Diesters are preferred, but salts of the monoester can also be used, in particular the alkali and alkaline earth metal salts as well as zinc and iron salts. Aside from sodium and potassium salts, in particular the calcium salt, magnesium salt and zinc salt are preferred.

A mixture of dimethyl fumarate and the calcium, magnesium and zinc salts of ethyl fumarate is also particularly suitable as a fumaric acid component. Such a mixture is used in dermatology for the treatment of psoriasis.

For short-chain fatty acids and their salts or esters, the maximum daily dose is up to 10 g, preferably up to 5 g. Typically, doses ranging between 0.5 g and 1.5 g per day are sufficient, for example in the form of two administrations of 0.5 g in the morning and evening. For example, one capsule or tablet may contain 0.5 g sodium propionate or calcium propionate.

The typical daily dose of fumarates is 2×120 mg or 2×240 mg in tablet or capsule form. However, using the inventive combinations with fumarates enables the maximum daily dose of the fumarate to be reduced to about half those stated above which reduces side effects.

The short-chain carboxylic acids of the invention and their esters and salts may be combined with other active agents as well as with vitamins, in particular with vitamins A, B12 and/or D.

In the invention, vitamin B12 refers to all compounds of the vitamin B12 group, i.e. cobalamins and in particular cyanocobalamin and storage forms of vitamin B12 as well as coenzyme B12.

Vitamin B12 has been shown to be effective in a number of diseases associated with immune system disorders such as MS, psoriasis and neurodermatitis. It is involved in the total fat metabolism. An incorrect colonization of the intestine can lead to a vitamin B12 deficiency.

A combination of fatty acids with vitamin B12 and preferably also vitamin D has proven to be beneficial. Vitamin B12 also promotes the resorption of short-chain fatty acids, such as propionic acid and sodium propionate.

The vitamin B12 content is based on the recommended dose, a maximum of 5 μg per day.

The inventive combination preparation may be provided in any marketable form. Preferred forms are capsules and tablets. The short-chain fatty acids in the form of solid salt, sodium propionate or calcium propionate, may be compressed into tablets using customary tableting means. If odor-intensive short-chain fatty acids and their salts and esters are used, odor-binding substances such as cyclodextrins can be admixed.

The individual active ingredients of the combination preparation proposed by the invention may be present together, i.e. in a capsule or tablet, or may be separately encapsulated or tableted. A suitable form for the daily administration is the introduction of the daily dose of the active substances, separately encapsulated, in a blister pack. For example with two capsules of sodium or calcium propionate of 0.5 g each and one capsule or tablet of dimethyl fumarate of 120 mg or 240 mg. In this case, any vitamin supplements, in particular vitamin B, are added to the fatty acid salt.

In studies with MS patients it is shown that the combined administration of fumarates (2×120 or 240 mg per day) and sodium propionate (2×0.5 g per day) results in-a significant increase in Treg cells by a factor of 1.6 (see FIG. 6). In comparison, other commonly used drugs for the treatment of MS together with sodium propionate only showed an increase by a factor of 1.1. The disproportionate increase in the amount of Treg cells signifies a corresponding reduction in the autoimmune response. Fumarates and short-chain fat carboxylates work together synergistically.

The invention also relates to the use of 03-8 carboxylic acids, their physiologically acceptable salts and esters with 01-8 alkyl alcohols together with fumaric acid esters and their salts and optionally vitamin B12 as immunomodulators useful for treating autoimmune-related diseases. These combinations may also be used to produce drugs intended to accompany the therapy for autoimmune diseases, and also as a dietary supplement having immunomodulating activity.

The inventive acids, in particular propionic acid and butyric acid have an influence on the intestinal physiology and the microbiome present there. In this way, they have an impact on the composition of the microbiome. The number of bacteria degrading propionate and butyrate increases significantly while at the same time the normal intestinal microbiota are only slightly affected. In contrast, long-chain carboxylic acids (lauric acid) cause the number of Provotellaceae and some families of Phylum Bacteroidetes present in mice to reduce significantly.

The relationship of metabolic syndrome with inflammatory diseases, particularly MS and psoriasis is a topic among experts. Metabolic syndrome is usually accompanied by a disorder of the intestinal microbiome. Propionate is conducive to counteracting such disorders and correcting abnormalities of the intestinal microbiome.

For the treatment of chronic inflammatory conditions and skin, the carboxylic acids and their esters and salts as used in the invention can be combined with other commonly used agents.

Accordingly, the invention also relates to the use of C₃-C₈ carboxylic acids, their physiologically acceptable salts and esters with C₁₋₈ alkyl alcohols in combination with fumaric acid esters and their salts and vitamin B12 as immunomodulators useful for treating MS and psoriasis.

It is recognized that the topical and oral application of propionic acid and propionates are largely equivalent with regards to their physiological effects. The studies in mice described below where fatty acids or salts thereof have been administered orally also allows for conclusions to be drawn about their topical application.

In mice treated with propionic acid, the number of regulatory T cells increases with the changes that occur in the microbiota (CD4+CD25+ Foxp3+ Treg). Gene expression profiling of signature cytokines showed increased values with respect to TGFβ1, IL-10—generally anti-inflammable messengers—and Foxp3 in propionic acid-fed mice with experimental autoimmune encephalomyelitis (EAE).

Moreover, the aliphatic chain length of the carboxylic acids also affects the Th1/Th7-mediated autoimmunity as well as the regulatory response of Treg in an in vivo mouse model. Mice fed a lauric acid enriched diet showed in the EAE model a significant reduction of TH1 and TH17 cells in the small bowel and at the same time an accumulation of Th1/Th17 in the central nervous system which suggests that the control of the inflammatory cells has been transferred from the bowel to the brain/spinal marrow. Under otherwise similar conditions, propionic acid caused a significant increase of TGFβ1, IL-10, and Foxp3. These results taken together and in comparison to a control group, showed a change towards worsening following the onset of the induced disease in the MS mouse model with a diet comprising long-chain fatty acids, whereas in mice that were prophylactically given propionic acid a significant improvement was observed. In this context, MS and psoriasis are to be regarded as largely similar.

As a result, propionic acid appears to be able to change and normalize a compromised balance occurring between Treg and effector T cells (Th1/Th17 Psoriasis patients show such a disturbed balance.

Examples Experimental Findings

Mice kept under standardized conditions were fed on a normal diet enriched with long-chain fatty acids (30.9% lauric acid) and with 200 μl of propionate daily administered orally. The propionate was given either at the time of disease induction (DI) or at the onset of the disease (OD).

For the induction of EAE the mice were anesthetized and administered two subcutaneous injections of a 50 μl emulsion applied to the left and right tail basis and comprising a total of 200 μg MOG₃₅₋₅₅ (myelin oligodendrocyte glycoprotein) and 200 μg Freund's adjuvant (CFA) with 4 mg/ml of M. tuberculosis. Pertussis toxin (200 mg/mouse) was given intraperitoneally on day 0 and day 2 after the induction. The clinical assessment took place on a daily basis using a 5-point scale (SEM). The assessment was as follows:

0=normal 1=Tail paralysis impairing raising 2=Gait ataxia 3=Paraparesis of hind legs

4=Tetraparesis 5=Death

Mice showing SEM 4 or 5 were excluded. Results are shown in the Figures.

Example 1. FIG. 1 shows results of a mouse population fed a diet enriched with lauric acid in comparison to a control group. Onset of the disease occurred approximately ten days after induction with the disease reaching its peak after seventeen days. With respect to SEM scores the control group scored better than the group fed the diet enriched with lauric acid.

Example 2. FIG. 2 shows a results of a comparison of mouse population fed with propionic acid diet versus a control group. The propionic acid was administered either on the day of induction (DI) or on the day of onset of disease occurred (OD). It was found that the group that was given propionic acid on the day the onset of disease occurred (OD) showed a significantly less favorable disease progression than the control group.

The influence of the propionic acid on the relative axonal density, the demyelination of the white matter, and the number of CD3+-cells is shown in FIG. 3. In general, the administration of propionic acid results in a significant improvement of the condition compared to the control group.

FIG. 4 shows the effect of administration of propionic acid on the CD4+−CD25+ Foxp3 cells expressed as a significant increase in comparison to the control group.

Example 3. FIG. 5 shows the effect of a lauric acid enriched diet on the CD4+CD25+ Foxp3 cells in comparison to a control group. The administration of the long-chain fatty acids leads to a reduction in T cells compared to the control value. The percentage reduction was dependent on the concentration of the long-chain fatty acids.

Example 4. FIG. 6 shows a comparison of the ratio of Treg cells after ad ministration of 2×0.5 g sodium propionate in combination with established agents (see below) for the treatment of MS in the usual dose before and after 14 days of treatment.

For the combination of sodium propionate and dimethyl fumarate (2×120 or 240 mg daily), the number of Treg cells increased by a factor of 1.6. In a comparison group treated with the patient-specific dose of interferon beta (Betaferon, Rebif 22), glatiramer acetate, teriflunomide or fingolimod together with the above stated amount of sodium propionate, the number of Treg cells increased by a factor of 1.1. 

1. Combination for use in the treatment of immune-mediated chronic inflammatory diseases and autoimmune diseases comprising a C₃₋₈ fatty acid, its physiologically tolerated salts and/or esters on the one hand and one or more fumaric acid esters and/or their physiologically tolerated salts on the other hand.
 2. Combination according to claim 1, characterized in that the fatty acids are straight-chained saturated fatty acids.
 3. Combination according to claim 1, characterized in that the fatty acids are C₃ or C₄ fatty acids.
 4. Combination according to claim 1, characterized in that the fumaric acid esters are fumaric acid dimethyl ester and/or the salts of fumaric acid monomethyl ester.
 5. Combination according claim 1, characterized in that said combination contains a mixture of fumaric acid dimethyl ester and salts of fumaric acid monomethyl ester.
 6. Combination according to claim 1, characterized in that the physiologically tolerable salts are salts of sodium, potassium, magnesium, calcium, zinc and/or iron.
 7. Combination according to claim 1, characterized in that said combination contains calcium or sodium propionate.
 8. Combination according claim 1, characterized in that methyl esters or ethyl esters are used as physiologically tolerable esters.
 9. Combination according to claim 1, characterized in that said combination additionally contains vitamin B12.
 10. Combination according to claim 1 for use in the treatment of psoriasis and multiple sclerosis.
 11. Combination according to claim 1, characterized in that said combination contains the C₃₋₈ fatty acid, its salts and/or esters and the fumaric acid esters and/or their salts in separately encapsulated or tableted form.
 12. Combination according to claim 1, containing 0.1 to 1.0 g of the C₃₋₈ fatty acid, its salts and/or esters in encapsulated or tableted form.
 13. Combination according to claim 1, containing 0.020 to [0.40 g] of fumaric acid esters and/or salts thereof.
 14. Combination according to claim 1, containing the active ingredients in one capsule. 